P2.1 Motion

Question 1

State the equation linking distance, speed and time. Give appropriate units.

Answer 1

Distance (m) = Speed (m/s) x Time (s)

Question 2

How can speed be calculated from a distance-time graph?

Answer 2

The speed is equal to the gradient of the graph.

Question 3

What must be done to calculate speed at a given time from a distance-time graph for an accelerating object?

Answer 3

• Drawing a tangent to the curve at the required time.

- Calculating the gradient of the tangent

Question 4

State the equeation for the average acceleration of an object. Give appropriate units.

Answer 4

Acceleration (m/s^2) = Change in velocity (m/s) / Time (s)

Question 5

How can the distance travelled by an object be calculated from a velocity-time graph?

Answer 5

It is equal to the area under the graph

Question 6

What is a scalar quantity?

Answer 6

• A quantity that only has a magnitude.

- A quantity that isn’t direction dependent

Question 7

What is a vector quantity?

Answer 7

A quantity that has both a magnitude and an associated direction.

Question 8

How can a vector quantity be drawn and what does it show?

Answer 8

• As an arrow.
• The length of the arrow represents the magnitude.
• The arrow points in the associated direction

Question 9

Is a force a vector or a scalar quantity?

Answer 9

• Vector

- It has both a magnitude and an associated direction

Question 10

Give three examples of vector quantities.

Answer 10

• Force
• Velocity
• Displacement

Question 11

Give three examples of scalar quantities.

Answer 11

• Speed
• Temperature
• Time
• Mass
• Distance

Question 12

How do you calculate average speed for non-uniform motion?

Answer 12

Average Speed (m/s) = Change in Distance (m) / Change in Time (s)

Question 13

What piece of apparatus may be used to record the time taken for a very fast object to move a given distance?

Answer 13

Light Gates